Yoshida Takefumi, Ninomiya Yoshikazu, Higuchi Masayoshi
Electronic Functional Macromolecules Group, National Institute for Materials Science (NIMS) Tsukuba 305-0044 Japan
RSC Adv. 2020 Mar 17;10(18):10904-10909. doi: 10.1039/d0ra00676a. eCollection 2020 Mar 11.
Four color electrochromism (yellow, magenta, blue, and navy) has been achieved in Cr(iii)-based metallo-supramolecular polymers (polyCr), which were synthesized by 1 : 1 complexation of Cr ions and 1,4-di[[2,2':6',2''-terpyridin]-4'-yl]benzene (L). The polymer structure was determined by X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS). The molecular weight of polyCr was calculated as 3.2 × 10 Da using right angle light scattering (RALS). The EXAFS fitting indicated that the bond distances of Cr-N are 2.020 Å and 2.208 Å. A film of polyCr shows multi-color electrochromism (EC) or absorption: a sharp peak at 380 nm at 0 V Ag/Ag (yellow), a sharp peak at 510 nm and a broad peak at 800 nm at -0.6 V Ag/Ag (magenta), a broad peak at 610 nm and between 700-900 nm at -1.2 V Ag/Ag (blue), a broad peak between 450-900 nm at -1.8 V Ag/Ag (navy). The transmittances change (Δ), the switching times for coloring and bleaching ( , ) and the coloration efficiency ( , ): [Δ, ( , ), ( , )] were [39.2%, (5.56 s, 1.39 s), (169 cm C, 230 cm C)] at 510 nm between -0.6 and 0.2 V Ag/Ag, [67.0%, (6.93 s, 2.52 s), (138 cm C, 172 cm C)] at 610 nm between -1.2 and 0.2 V Ag/Ag, [86.1%, (6.80 s, 3.03 s), (167 cm C, 134 cm C)] at 780 nm between -1.8 and 0.2 V Ag/Ag, respectively, during the cycles. The durability experiment indicates that polyCr shows an EC property for at least 100 cycles.
基于铬（III）的金属超分子聚合物（聚铬）实现了四色电致变色（黄色、品红色、蓝色和藏青色），该聚合物通过铬离子与1,4 - 二[[2,2':6',2'' - 三联吡啶]-4'-基]苯（L）以1:1络合合成。聚合物结构通过X射线吸收精细结构（XAFS）测量和X射线光电子能谱（XPS）确定。使用直角光散射（RALS）计算出聚铬的分子量为3.2×10 Da。扩展X射线吸收精细结构（EXAFS）拟合表明Cr - N的键长为2.020 Å和2.208 Å。聚铬薄膜呈现多色电致变色（EC）或吸收：在0 V Ag/Ag时380 nm处有一个尖锐峰（黄色），在 - 0.6 V Ag/Ag时510 nm处有一个尖锐峰且在800 nm处有一个宽峰（品红色），在 - 1.2 V Ag/Ag时610 nm处有一个宽峰且在700 - 900 nm之间有一个宽峰（蓝色），在 - 1.8 V Ag/Ag时450 - 900 nm之间有一个宽峰（藏青色）。透过率变化（Δ）、着色和漂白的切换时间（ ， ）以及着色效率（ ， ）：在 - 0.6和0.2 V Ag/Ag之间510 nm处为[39.2%，（5.56 s，1.39 s），（169 cm C，230 cm C）]，在 - 1.2和0.2 V Ag/Ag之间610 nm处为[67.0%，（6.93 s，2.52 s），（138 cm C，172 cm C）]，在 - 1.8和0.2 V Ag/Ag之间780 nm处分别为[86.1%，（6.80 s，3.03 s），（167 cm C，134 cm C）]，在循环过程中。耐久性实验表明聚铬至少在100个循环中表现出电致变色特性。
